Constant multiplier control



Oct. 30, 1945. A. B ADO 2,388,211

CONSTANT MULTIPLIER CONTROL Filed Sept. 8', 1941 14 Sheets-Sheet l RUUKHnun Bnvcntor fln/hpng 5. Machaa'a I Gttorneg Oct. 30, 1945- A. B.MACHADO CONSTANT MULTIPLIER CONTROL Filed Sept. 8, 1941 14 Sheets-Sheet3 3nventor '40 zhony 5. MEG/750 0 Gttorneg Oct 1945- A. B. MACHADOCONSTANT MULTIPLIER CONTROL Filed Sept. 8, 1941 14 Sheets-Sheet 4 EN m ww mm m KW m Oct. 30, 1945. A. B. MACHADO 2,388,211

CONSTANT MULTIPLIER CONTROL Filed Sept. 8, 1941 14'Sheets-Sheet 5 3mentor Oct. 30, 1945.

B. MACHADO CONSTANT MULTIPLIER C ONTROL Filed Sept. 8, 1941 14Sheets-Sheet 6 Gttomeg Oct. 30, 1945. A. B. MACHADO CONSTANT MULTIPLIERCONTROL Filed Sept. 8, 1941 14 Sheets-Sheet 7 Zhwenfor ril /zany 5.l7ac/vaoo (Ittorneg Oct. 30, 1945. A. B. MACHADO CONSTANT MULTIPLIERCONTROL Filed Sept. 8, 1941 14 Sheets-Sheet 8 Inventor Ma chado (IttomegOct. 30, 1945. A. B. MACHADO CONSTANT MULTIPLIER CONTROL Filed Sept. 8,1941 14 Sheets-Sheet 9 3 f i why 5. Mac/1 .22a

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Oct. 30, 1945. A. B. MACHADO CONSTANT MULTIPLIER CONTROL 14 Sheets-Sheet11 Filed Sept. 8, 1941 3nnentor HIV/hang D. Masha do 3 w Ev GttornegOct. 30, 1945. A. B. MACHADO CONSTANT MULTIPLIER CONTROL Filed Sept. 8,1941 14 Sheets-Sheet l2 A TTORNEY Oct. 30, 1945. A. B. MACHADO CONSTANTMULTIPLIER CONTROL Filed Sept. 8, 1941 14 Sheets-Sheet 15 -um m-H-t l3nventor fin/hony 5. Machado Gttorneg Oct. 30, 1945. A. B. MACHADOCONSTANT MULTIPLIER CONTROL Filed Sept. 8, 1941 14 Sheets-Sheet l4 mm mhw-hd l Zhwentor ,4/7/hang 5. Machaao Gttorneg Patented Oct. 30, 1945CONSTANT MULTIPLIER CONTROL Anthony B. Machado, Oakland, Calili,assignor to Friden Calculating Machine 00., Inc., a corporation ofCalifornia Application September 8, 1941, Serial No. 409,955

3 Claims.

Thi invention relates to calculating machines and is concerned moreparticularly with the provision of improved automatic control meanstherefor in multiple item entering operations.

It is a general object of the invention to provide an improvedcalculating machine having automatic control means for effectingmultiple entry of an item in a selected ordinal position.

Another object of the invention is to provide a calculating machine ofthe character referred to havin tabulating mechanism and multipliermechanism which can be coordinated by selective control to first effecttabulation of the accumulator to a selected ordinal position undercontrol of the tabulating mechanism and then to effect entry of the itemfor the desired number of times under control of the multipliermechanism, particularly where the same multiplier factor i used in aseries of calculations.

Other objects and advantages of the invention will be apparent from thefollowing description of a preferred embodiment as illustrated in theaccompanying drawings, in which:

Figure 1 is a plan view of the right hand portion of a calculatingmachine embodying the invention;

Figure 2 is a longitudinal sectional elevation through the rear portionof the calculating machine taken in a plane indicated by the line 2-2 inFigure 1;

Figure 3 is a fragmentary sectional view of a part of the tabulatorcontrol mechanism taken as indicated by the line 3-3 in Figure 1;

Figure 4 is a fragmentary elevational view with certain parts insection, the view being taken as indicated by the line 4-4 in Figure '7;

Figure 5 is a schematic plan view of the rear portion of the calculatingmachine with the carriage and keyboard removed. Certain parts are shownin section and others are omitted to clarify the view;

Figures 6 and 6A together present a side elevational View of the rightside plate and the parts mounted thereon, as indicated by the line 6-4;in Figure 1;

Figure '7 is a fragmentary, rear elevational view of the right portionof the machine taken as indicated by the line 'l-'l in Figure 1;

Figure 7A is a continuation of the upper portion of Figure '7;

Figure 8 is a perspective view of a part of the tabulator controlmechanism;

Figure 9 is a perspective view of a part of the tabulator controlmechanism;

Figure 101s a sectional elevation looking toward the inside wall of theright side plate as indicated by the line IU-|0 in Figure 1;

Figures 11 and 11A combined present an elevational view of a part of thecontrol mechanism as indicated by the line I l--ll in Figure 1;

Figures 12, 13, 14 and 15 are operational views of various parts of thetabulator control mechanism as will appear more clearly in connectionwith the description of the operation of the machine;

Figure 16 is a right side elevational view of the multiplier mechanismwith certain parts shown in section, the view being taken as indicatedby the line I l-l6 in Figure 1;

Figure 17 is a right side elevational view of the multiplier mechanismwith certain parts omitted to clarify the view;

Figure 18 is a sectional elevational view taken as indicated by the linel8--l8 in Figure 1;

Figures 19, 20, 21 and 22 are schematic operation views of themultiplier mechanism and its operative coordination with the tabulatingmechanism.

The invention is disclosed as embodied in a calculating machine havingactuating mechanism of the uni-directional, continuous drive cycle typewherein all power driven operations are effected by engagement anddisengagement of a single clutch providing the only path of power flowfrom the motor of the machine to the motor-driven parts thereof. Acalculating machine of this construction is disclosed in the copendingapplication of Carl M. Friden, Serial No. 42,268, filed September 26,1935, now Patent No. 2,310,281, which issued February 9, 1943.

The frame of the machine includes a base 10 (Figures 1, 2 and 5) onwhich left and right side frame plates 12 and 13 are mounted withincasing H. Side plates l2 and I3 may be connected by cross brackets IS,ll, 18 and I9 (Figures 2 and 5) which serve to support variousmechanisms of the machine. The register carriage 22 (Figures 1 and 2)which supports the accumulator and the revolutions counter is suitablymounted on the frame brackets I6 and 19 for endwise shifting movementlaterally of the machine in either direction to various ordinalpositions as controlled by means described hereinafter.

Carriage 22 (Figure 2) includes a frame Si in which numeral wheel shafts32 are journaled to carry numeral wheels 33 of conventionalconstruction. Numeral wheels 33 have projectin twirler knobs 33a formanual setting thereof. To transmit increments of value to numeralwheels 33, each shaft 32 extends below the frame 3| and has a ten-toothgear 34 which is actuated by means later described.

Accumulator resetting means Means are provided on the carriage forresetting the numeral wheels 33 (Figure 2) to zero registrationincluding means such as a rack bar 4| mounted for endwise slidingmovement in the carriage frame adjacent the upper end of the numeralwheel shafts 32 for cooperation with mutilated gears 42 carried bynumeral wheel shafts 32. Adjacent gears 42 are axially offset tocooperate with the adjacent vertically offset racks formed on rack barfiI in the usual manner. W'hen rack bar -il is moved from its normalposition to which it is spring urged in the usual manner, it will engagethe gear 42 of a numeral wheel 33 displaced from the zero position andreset the numeral Wheel to such position. Rack QI carries a handle 44(Figure 1) for manual operation and may be connected to an actuating bar43 for power operation. Bar 13 is suitably mounted for sliding movementon the frame 3| and may be selectively coupled with rack bar 4| Thismechanism is disclosed and claimed in the copending application of CarlM. Friden, Serial Number 240,269, filed November 14, 1938, now PatentNo. 2,294,083, which issued August 25, 1943.

Drive, selecting and actuating mechanisms The values to be introducedinto numeral Wheels 33 are selected by means of a plurality of banks ororders of settable value keys SI (Figures 1 and 2) of conventionalconstruction. Keys 6| are mounted for endwise sliding movement and areadapted to be latched in depressed position by a latching bar 32associated with each bank of keys 6| and adapted to be operated torelease a depressed key by zero key 63 in each order. All of the ordersof keys can be released simultaneously by the operation of a keyreleasing gate- 64 extending along the front edge thereof in the usualmanner. Gate 54 is operable through link 65 (Figure 6A) and bellcrank 55by means of keyboard release key 61 (Figure 1) in the usual manner.

The keys 5| (Figure 2) cooperate with selecting mechanism includingspring urged selecting slides 58 mounted for endwise movement to posi--tion gears 50 selectively with respect to the stepped teeth of theassociated actuating cylinders I9. Cylinders it for adjacent orders aremounted on actuating shafts II (Figures 2 and 5) having suitable bevelgear connections with a transverse drive shaft 12 which is suitablyjournaled in side plates I2 and I3.

Shaft 32 and shafts 'II are driven cyclically from motor 73 (Fig. 2)through clutch I l (Figures 5 and 6) which may be driven by suitablegearing l5 from the motor shaft I5. Clutch 14 may be engaged ordisengaged by oscillation of spring urged clutch pawl or dog II mountedfor rotation with shaft 52 and with respect to ratchet T8 journaled onshaft 12 and driven by gearing I5. Clutch control lever '59 is pivotedon side plate I3 to determine engagement or disengagement or the clutchby releasing or engaging the nose of dog I? in the full cycle positionthereof.

The number of increments transmitted to a gear 63 (Figure 2) by acylinder "I0 during cyclic operation of the clutch is transmitted to asquare shaft 8! which carries each ordinal pair of gears 69 and extendsrearwardly of the machine in the usual manner. Each shaft 8| carries aspool 02 having bevel gears 83 and 84 for cooperation with the alignednumeral wheel gear 34.

The engagement of gears 83 and 34 with gears 34 is controlled by strap85 positioned between the gears and mounted by suitable arms 85 forrocking movement with shaft 81. Thus, rocking of shaft 81 determinestransmission of said increments to the numeral wheels and also thedirection of entering thereon. Any suitable control means such as pluskey 88 (Figure l) and minus key 83 may be provided for rocking the shaft87 to cause positive and negative registration as shown in Patent No.2,229,889, dated January 28, 1941. Shaft 81 may be centralized by a pairof spring urged centralizing arms 9I (Figure 2) cooperating with acentral stop 92 and engaging a pin 93 carried by one of arms 85.

Revolutions counter mechanism The revolutions counter may comprisenumeral Wheels 5I (Figure 2) on shafts 52 which may be reset to zero byrack bar 53 similar to the rack bar ll described above. Rack bar 53carries handle 48 (Figure l) for manual operation and may be selectivelyconnected to actuating bar 43' as described in said Patent No.2,294,083.

The numeral wheels 5i (Figure 2) are actuated by means of a conventionalactuator 54 mounted on a shaft 55 which is rocked from drive shaft I2through a spring connection in a clockwise di- Carriage shift mechanismThe carriage can be shifted selectively in either direction by powerdriven means controlled by manually operable keys, and this mechanism isof conventional construction. Carriage 22 is provided with toothed shiftrack IOI (Figures 2 and '7) along the rear side thereof for cooperationwith shift pins I02 on shift gear I03. Shift gear I03 (Figures 5 and 7)can be rotated in either direction and receives one-half rotation foreach rotation of the clutch referred to above. For this purpose theshift gear I03 is connected by suitable gearin I04 to respective gearsleeves I06, I01, the gearing being arranged so that the drive from gearsleeve I06 rotates gear I03 in one direction, and the drive from gearsleeve I01 rotates gear I83 in the other direction. The respective gearsleeves I05, I01 (Figure 5) are slotted for engagement by toothedcollars I08, I09 mounted slidably but non-rotatably on the rearward endsof a pair of adjacent actuating shafts I I.

The sliding movement of collars I08, I09 (Figure 5) is controlledthrough forks III) by means of spring-urged rods III, II! which extendforwardly of the machine and abut similar depending arms H3, H4 carriedby shaft H6 and sleeve Ill mounted thereon. Adjacent side plate I3(Figures 5 and 10) shaft H6 and sleeve Ill have upstanding arms H8 andH9 operated by suitable rollers on shift keys I2I and I22 so thatselective depression of the keys controls the direction of carriageshifting.

To enable the power drive, shift keys I2! and I22 (Figure 6) haverespective pins I23 cooperating with lever I24 operatively connected bylever I26 to control contacts I21 of the motor drive, and connected bylink I28 with clutch control lever 19. Thus, on depression of either ofkeys I2I or I22, the clutch is engaged and the motor circuit enabled.

From the foregoing, it is seen that the carriage can be shiftedselectively in either direction.

Tabulation and dividend entry The tabulating and dividend enteringmechanism is of the type disclosed and claimed in the copendingapplication of Carl M. Friden and Anthony B. Machado, Serial No.315,986, filed January 27, 1940, for "Calculating machine, and operatesto zeroize the registers as a preliminary to a division operation, andto effect entry of the dividend into the accumulator in any selectedordinal position which may be pre-set in accordance with the problembeing solved, while suppressing the usual count made in the revolutionscounter during entry of a number in the accumulator. After setting ofthe dividend into the keyboard, the only other operation necessary isthe depression of the dividend control means or key, after which themachine automatically operates to perform the above described functions,the desired ordinal position. of the carriage upon entry of the dividendhaving been preset in accordance with the number of quotient figuresdesired, or the desired position of the decimal point in the quotient.

The first operation which occurs upon depression of the dividend key isa shifting of the carriage to its leftmost position if displacedtherefrom for a power clearance operation.

Dividend or tabulating Icey.--Referring to Figures 1 and 6, dividend keyI 4i is mounted for endwise sliding movement in side plate I3 by meansof pin I42 engaging a slot therein. Spring I43 urges key I4I to theraised position shown in Figure 6. The lower end of key I4I is providedwith elongated slot I44 which is engaged by pin I46 carried at the endof lever I41 mounted on transverse shaft I48 (Figures and 6).

Intermediate its ends, key I4I (Figure 6) is provided with latching faceI5I for engagement by the latching end of a latch slide I52 mounted forendwise sliding movement on side plate I3 with its rear end pivotallysupported on upstanding pivotally mounted arm I53. Spring I54 isassociated with arm I53 to urge slide I 52 to latching position. Thus,upon depression of key !4I it is latched in depressed position, and itremains there until the end of the operation when delatching occurs bymeans described later.

Depression of key I4I serves to enable a shift of the carriage to theleft, to enable a power clearance mechanism, to condition the shift tothe right, to block out the coimter actuator and to enable the drive.

The shift of the carriage to the left and the power clearance mechanismfor the registers is enabled upon depression of key l il (Figures 5 and6) when the key operates through arm I41 to rock the shaft I48 in aclockwise direction as viewed in Figures 2 and 6. Referring to Figure 2,shaft I48 carries an upstanding arm I56 which is connected to aforwardly extending pusher link I51 by an eccentric pivot I59. Pusherlink I51 carries a pin I59 cooperatively related with depending arm IBIsecured on transverse shaft H6. Shaft II6, as previously described,carries a depending arm II3 (Figure 5) which abuts the end of shiftcontrol rod I I I for the shift drive connection to the left. Thus, upondepression of the dividend key the shift drive connection determiningshifting to the left will be engaged by the above described linkage.

To enable the power driven resetting mechanism, pusher link I51 (Figures2 and 5) is provided with offset notched end I62 in operative pushingengagement with the end of control rod I63 for the power clearancedrive. This engage ment is maintained by the tension of spring I64connected between pusher link I51 and arm I56. As seen in Figure 5, rodI63 extends rearwardly and carries control fork I 66 for shiftable driveestablishing collar I61 having a slidable but non rotatable drivingengagement with one of the actuating shafts 1|, and being toothed forengagement with the slotted hub 168 of cam I 69. As seen in Figure 7A,cam I69 is operatively related with arm I1I to drive actuating slide I12for power resetting, which in the leftmost position of the carriage isoperatively related to arm I13 (Figures '7 and 7A) carried by actuatingbar 43. The above described mechanism forms part of a conventional powerreturn clearance mechanism as described in said patent to Carl M.Friden, No. 2,294,083.

From the foregoing it will be seenthat upon clockwise oscillation ofshaft I48, as viewed in Figure 2, caused by depression of the dividendkey, pusher link I51 operates to push rod I63 rearwardly against thetension of spring I14, and to thereby engage the drive connectionbetween collar I61 and hub I68, so that power resetting will occur whenthe carriage is in its leftmost position. As described later, thiscontrol is disabled at the end of the resetting operation.

As previously stated, depression of the dividend key I4I also serves toblock out the counter actuator and prevent operation thereof, and tocondition the shift mechanism for shifting to the right at the end ofthe return-clear operation.

As seen in Figures 6 and 10, the lower end of dividend key MI is engagedin its uppermost position with a roller I8I carried by lever I82,pivoted at I83 on side plate I3. Lever I82 carries a roller I 84 (Figure10) operatively disposed beneath the forwardly extending arm I85 of abellcrank I86 pivoted on shaft I 81 which is suitably mounted on sideplate I3. The movement of bellcrank I86 is utilized to block the counteractuator from operation and also to condition the shift mechanism forshifting the carriage to the right at the end of the return-cleaoperation.

In order to block out the operation of the counter actuator by movementof the bellcrank I86 (Figure 10), the upright arm I88 of the bellcrankI86 carries a pin I 89 operatively engaged with lever I 99, pivoted atI9! on side plate I3. The upper end of lever I90 is pivotally connectedat I92 with blocking slide I93 having projection I94 lying normally outof the path of oscillation of arm 58 of the counter actuator assembly.counterclockwise rocking movement of bellcrank I86 operates throughlever I99 to move the slide I93 and projection I 94 thereof from theposition shown in Figure 10 to that shown in Figure 14, where movementof the counter actuator to active position is prevented as previouslyexplained in connection with the neutralizer slide 51.

In order to condition the shifting mechanism for tabulation to theright, arm I96 (Figures 7, 9

and 12) is formed integrally with bellcrank I36 and is pivotallyconnected at I91 to a link I98 extending rearwardly and'riding on rollerI09 on an arm 20! (Figures 7, 8 and 12) also pivoted on shaft I31. Arm20I has an arm 203 connected thereon and is connected thereto by spring202 so that arm 203 is biased to move with' arm 20I. Shift engaging arm203 has a curved upper end 204 operatively engaged with shiftcontrolling fork IIII (Figs. 7 and 12) of the right hand shiftingmechanism. Link I98 is adapted 'to be disposed between the roller I99and a lever 205 (Figures 7 and 12) pivoted at 201 on bracket I6. Uprightend 208 of leve 206 has slotted engagement with a stud 209 on bracket I6and is spring-urged upwardly by spring 2| I.

In order to establish a driving relation between the lever 206 and arm20I, link I98 is provided with a raised portion 2I2 which normally isdisposed out of the path of the lever 206, as shown in dotted lines inFigure 12, but is moved into the full-line position upon depression ofthe dividend key, so that when the lever 2433 is subsequently depressed(Fig. 13), as later described, arm 20I is rocked to operate throughspring 202 to place a bias on arm 203 to engage the shift clutch fordetermining shifting or tabulation to the right as later described.

The dividend key I II also engages the clutch and enables the motorcircuit. It will be recalled that shaft I48 (Figure is rocked in acounterclockwise direction upon depression of the dividend key, andduring such movement a depending arm 2I6 serves through its pin 2I'I torock an arm 2I8 pivoted at 2I9 on side plate I3, and having anupstanding finger 22I operatively related with roller 222, carried atthe lower end of lever I26 (Figures 6 and 10). Upon counterclockwisemovement of arm 2I8 (as viewed in Figure 10) lever I26 (Figure 6) willbe rocked in a counterclockwise direction to close contacts I21, and tooperate through lever I24 and link I28 (Figure 6) to move clutch controllever I9 from the position shown in Figure 6 to its clutch engagingposition out of engagement with the clutch dog TI.

Thus upon depression of the dividend key IIII, the first operation whichensues is a shifting of the carriage to its leftmost position ifdisplaced therefrom, where a clearing or resetting operation isperformed on either or both of the accumulator and counter. The clearingof the registers occurs during a cycle of operation with the carriage inits leftmost position, as shown in Figure 7, where one of shift pins I02is engaged in the endmost tooth space of shift rack IOI, which is formedin part by pawl 226, pivoted at 221 on the rack and urged against pin228 by spring 229. With the carriage in the position shown, shift pinI02 during the clearing cycle, rotating in a clockwise direction servesto oscillate pawl 225 so that its extension 230 strikes end 208 of lever205. and moves it downwardly, and this movement is utilized to initiateshifting of the carriage to the right to the selected position forentering the dividend.

At the beginning of the clear cycle, the parts are positioned as shownin Figure 12, where interponent arm I98 has its projection 2I2 disposedbetween the end 208 of lever 203 and roller I99 on shift conditioningarm I. Thus, when pawl 226 moves downwardly, lever end 208 is depressedfrom the position shown in Figure 12 to that shown in Figure 13, whenlever 20I operates through spring 202 to place tension on shift engagingarm 203. The movement of shift engaging arm 203 from the position shownin full lines in Figure 13 to that shown in dotted lines is delayeduntil the end of the cycle by interlock means associated with the shiftengaging mechanism.

Referring to Figures 5 and 7, the interlock means comprises lever 23Lpivoted at 232 on rear frame bracket I6, and having a pair of upstandingpins 233 spaced from and disposed in the path of respective shift forksI I0 carried by rods I I I and I I2. As seen in Figure 5, when one shiftfork is moved rearwardly to engage the corresponding shift driveconnection, the opposite pin 233 moves into blocking engagement with theother shift fork II!) to prevent operative movement thereof until theother shift drive is disengaged. Inasmuch as the shift drive fordetermining shifting to the left remains engaged until rocking of pawl226 during the clear cycle, initiation of the shift to the right bymovement of shift rod II2 by the hooked end 204 of arm 203 cannot occuruntil the end of the resetting cycle.

During the resetting cycle, certain other conditionings are affected inthe machine. As seen in Figures 7, 8 and 10, arm 20I has integrallyformed therewith a bellcrank 236 and both arm 20I and bellcrank 236 areurged to the position shown in Figure 12 by spring 231 attached to arm20I and to the frame. The movement of the bellcrank 236 with arm 20!from the position shown in Figure 12 to that shown in Figure 13 isutilized to condition the control for entering the dividend at the endof the shifting operation to the right, and for maintaining the shiftengaged until the selected tabulated position is reached.

To latch the bellcrank 233 and arm 20! in the position shown in Figure13, the lower horizontal arm of bellcrank 236 is provided with laterallyextending ear 238 adapted for engagement with a seat in a latch lever239, pivoted at 2 on side plate I3, and urged in a clockwise directionby spring 242. As shown in Figure 13, upon clockwise movement of arm 20Iand bellcrank 230, they are latched in position by latch lever 239.

The movement of bellcrank 236 also serves to condition means forengaging the plus-minus gears to enter the dividend at the end of theshift operation. For this purpose the upper arm of bellcrank 236 (Figure12) is pivotally connected to a link 266, which is pivotally connectedat 241 with a depending arm 2G8 pivoted to an actuating slide 249mounted for vertical sliding movement on side plate I3, by slottedengagement with respective pins 25 I. As shown in Figure 12, dependingarm 228 is normally to one side of an ear 252 of an arm 253 which formspart of a control to determine engagement of the plus-minus gears forentry of the dividend. Arm 253 (Figures 6, '7 and 14) is pivoted onshaft I81 and has integrally formed therewith an arm 254 carrying aroller 256 abutting a latch lever 251 pivoted on side plate I3 and urgedin a clockwise direction by spring 258. As shown in Figures 13 and 14,arm 243 is operatively related to ear 252 so that downward movement ofslide 249 will operate arms 253 and 254 to release latch lever 25? aslater described.

The movement of lever 206 and end 208 thereof during the resettingoperation also determines release of the shift connection determiningshifting to the left. For this purpose bellcrank 2BI (Figures 7 and 10)is pivoted on shaft 8'! and has one arm disposed beneath end 208 oflever 203. The depending arm of bellcrank 26I is pivotally connected tolink 262, having its forward end piv otally connected to depending arm263 secured on transverse shaft 264 (Figures and Shaft 264 (Figures 2and 5) carries an arm 266 which is slotted at its offset end to receivepusher link I51. Thus, counter-clockwise movement of the bellcrank 26I,as viewed in Figure 10, moves link 262 forwardly to rock shaft 264 in acounterclo kwise direction (in a clockwise direction as viewed in Figure2) so that arm 266 lifts pusher link I51 against the urgency of springI64 to move end I62 thereof out of engagement with push rod I63 for theclear mechanism, and to disengage pin I59 from arm I6I of the controlmeans for determining shifting to the left. In this manner, both theshift connection for left hand shifting and the drive connection orresetting are disabled during the cycle performing the resettingoperation so that they can be disengaged near the end of such cycle.

Tabulation control As seen in Figures 1, 2 and 3, the carriage 22 isprovided with a series of tabulator keys 21I, numbered 0 and 2 to 9 inaccordance with the position of the carriage. In the first or leftmostposition of the carriage zero tabulator key 212 is aligned with arrow213 on the casing of the machine. Tabulator keys 21I, 212 are mountedfor vertical endwise movement in broached slots in carriage frame bar214, and keys 21I can be latched in depressed position by latching slide216 (Figures 2 and 3), urged by spring 219. Slide 216 is adapted toengage over the tooth 211 of a depressed key. Zero key 212 provides arelease key for any depressed key 21I which it may be desired to releasein changing the setting of the machine to cause positioning of thecarriage in its rightmost position. In alignment with the 10 key 21I, asuitable fixed cam (not shown) is provided on the carriage whichoperates arm 282 (referred to hereinafter) irrespective of thedepression of 10 key 21I. Thus, 10 key 21I is a dummy key providedmerely for the operators convenience. Latching slide 216 is maintainedin position in the frame bar 214 by retaining bracket 218. Keys 21I and212 are urged to their raised positions by suitable springs.

A depressed key 21I, as indicated in dotted lines in Figure 3, isadapted to engage a V- shaped laterally extending ear 23I of an arm 282,pivoted at 283 on frame bracket I9. As shown in Figure 3, in theleftmost position of the carriage, release key 212 is aligned with theextension 28I, and correspondingly if the carriage is displaced one ormore ordinal spaces from its leftmost position, the corresponding key21I will engage the nose 28I and depress the arm 282. Adjacent its end,arm 282 (Figures 3 and 14) carries roller 284 which is disposed abovethe upper end of actuating slide 249. Thus, when the carriage shiftsinto a predetermined position, the actuating slide 249 is operated tomove latch 239 from the position shown in Figure 14 to that shown inFigure 15, to release bellcrank 233 and arm I and thereby permitdisengagement of the shift mechanism for shifting the carriage to theright. This operation will occur toward the end of the last shift cycle.

The downward movement of actuating slide 249 as the carriage enters itsselected position also serves to release spring actuated means formeshing the plus-minus gears, and for releasing the dividend key. Thedownward movement of slide 243 (Figure 14) acts through interponent arm248 and arms 253 and 254 to rock latching arm 251 in a counter-clockwisedirection and thereby move its latching notch 29I out of the path ofoffset ear 292 of a bellcrank 293, pivoted on pin 294 on side plate [3.Bellcrank 293 is urged in a counter-clockwise direction by a relativelystrong spring 206 (Figure 6).

As shown in Fig. 15, the ear 292 of lever 293 moves in front of the ear33! at the lower end of the lever I99 to retain the slide I93 in itsforward position to prevent actuation of the revolutions counter duringthe following cycle in which the dividend is entered in the accumulator.

The upper end of lever 293 has a cam face 291 (Figs. 14 and 15) whichengages a roller 293 on lever 299 whose hub forms one element 32I (Fig.5) of a clutch, the other element 322 of which is secured to the shaft81. Movement of lever 299 is transmitted through this clutch to shaft81, thereby swinging arms 35 and gate 85 to engage addition levels 83(Fig. 2) with bevels 34 on shafts 32 of accumulator dials 33.Accordingly, in the cycle following arrival of the carriage in itstabulated position the dividend value set in the keyboard is entered inthe accumulator.

Movement of lever 299 also serves to actuate latch slide I52 (Figure 6)and thereby release the dividend key.

The movement of bellcrank 293 which initiates the dividend enteringoperation also enables means for restoring such bellcrank to inoperativeposition. As shown in Fig. 11, the lower end of bellcrank 293 isconnected by link 306 with an arm 301 pivoted on plate 390 and havingits upper end normally disposed out of the path of a roller 333, carriedby a disc 399 on the end of transverse shaft 12. However,counterclockwise movement of bellcrank 293 serves through link 306 tomove arm 391 into the path of roller 308, so that near the end of thedividend entering cycle of operation after entry of the dividend intothe accumulator, roller 308 rocks arm 301, and through link 333oscillates bellcrank 293 in a clockwise direction so that latch 251 canagain move to active position as shown in Fig. 14. The return ofbellcrank 293 also moves tooth 292 thereof out of engagement with tooth30I so that lever I90 and link I93 can return to inactive position, asshown in Fig. 10. Arm 301 (Fig. 11) carries pin 3II normally positionedcentrally of slot 3I2 in link 3I3 which is pivoted on pin 3I4 carried bylink I28 (Fig. 6) of the drive controlling linkage. Movement of arm 391clockwise in Fig. 11 positions pin 3II in the right hand end of slot 312to thereby maintain the parts in drive establishing relationirrespective of release of ke MI in an early part of the cycle.

Tabulation without dividend entering If desired, a control may be setwhereby the carriage may be tabulated to a selected position withoutentering of the dividend, for example, if the amount set in the keyboardis to be used as a constant divisor and the dividend is set in theaccumulator by means of twirlers 33a. As seen in Fig. '1, lever 299 isnot directly secured to shaft 81, but is provided with a hub 32I havinga clutch connection with a second clutch element 322 secured on shaft81. Clutch elements 32I and 322 are normally urged apart by spring 323,but are held in engaged position by the lever 324, pivoted at 326 tobracket 295. The lower end of lever 324 is held in the position shown byroller 321 on double arm lever 328 (Figures '1 and 11) pivoted on sideplate It. Lever 328 may be suitably controlled as described in saidapplication, Serial No. 315,986, filed January 27, 1940, to permitdisengagement of clutch elements 32l and 322 and thereby eliminate thedividend en'- tering function.

Multiplier mechanism The multiplier mechanism is of the general typedisclosed in the copending application of Carl M. Friden and James H.Gemmell, Serial No. 107,806, filed October 27, 1936, for Calculatingmachine, now Patent No. 2,327,704, which issued August 24, 1943. Themechanism includes a series of multiplier keys 40! corresponding tomultiplier digit values of from one to nine and each of which effects ondepression thereof a number of registrations of the multiplicandcorresponding to the value of the depressed key. At the conclusion ofany such registration, the carriage is shifted one step to the right, sothat the ke correspondin to the next higher order multiplier digit canbe depressed, until the entire product is registered.

Depression of a multiplier key 40! serves to set the multiplierselection mechanism, to release the multiplier rack to receive suchselection, to enable the multiplier rack actuator, and to set variousinterlocks, all as described. hereinafter.

As seen in Figures and 7, multiplier frame plate 452 is secured on sideframe plate l3 in spaced relation therefrom by suitable spacers.Multiplier keys 40] are similar and similarly mounted, the entire keysection being assembled as a uniton the multiplier plate. Each key Mil(Figure 16) is mounted for endwise movement in a multiplier key frameassembly 403 and is yieldably held in its upper inactive position bysinuous coil spring 404 which extends over suitable frame studs andunder suitable pins on the keys 4M. Each key 41H after depressionthereof is operatively engaged by lock slide 406 as will presently bedescribed. Normally the slide is spring-urged toward therear of themachine as shown in Fig. 16. Key 401 is a dummy key and performs nofunction.

As stated above, depression of a key dill serves to set the multiplierselection mechanism, which is preferably in the form of a series ofstops for cooperation with the multiplier rack which is released forengagement with a set stop by the depression ofa multiplier key. Eachkey 453! (Figure 16) carries pin 468 at its lower end for cooperationwithrthe associated selecting arm 4 99, which has its lower end pivotedon strap 4l0 secured on multiplier plate 482. Each arm is pivotallyconnected intermediate its ends to one of selecting stop links Ml whichextend rearwardly of the machine between multiplier plate 482 andretaining strap M2 suitably secured in spaced relation thereon. Springs413 are tensioned between strap H2 and links 4| I and serve to urgelinks M l to the inoperatve positions thereof illustrated in Figure 16,with arms 409 engaging pins 458 on the multiplier keys.

Adjacent their rear ends each link 4 carries a flanged stud li l whichengages in a corresponding guide slot formed in the arcuate forward edgeof guide plate 416, which is suitably secured in spaced relation frommultiplier plate 62, As seen in Figure 17, each link 4H has beveledstopend l'Land ends M! are positioned in an arc forcooperation, whenprojected to active position, with a multiplier rack as describedhereinafter.

'tively strong spring 443.

From the above description, it appears that depression of a multiplierkey 4t! serves to rock position and is released by depression of amultiplier key to move into engagement with the set stop M7.Subsequently, the multiplier rack is returned step by step to and pastits inactive position for a purpose later described.

Multiplier rack 42| (Figure 17) is pivotally mounted on stub shaft 522secured between multiplier plate 462 and guide plate 416. Back 42! isformed as an arcuate sector and has ten teeth 423 formed on theperiphery thereof, adjacent unbroken arcuate portion 426 whichterminates in beveled stop engaging face 525. Rack 42! is urged in aclockwise direction by spring 42?, and is held in its inoperativeposition shown in Figu're 17 by latch pawl 628 which has the flat endthereof engaged with face 526 of the rackv Latch pawl 428 is pivoted at429 on guide plate M6 and is oscillated upon depression of a multiplierkey 39! to release rack 62! and permit movement thereof by spring 32?into engagement with the stop 4! l which is set by the depressed keyMil. For this urpose, latch pawl 428 (Figure 16) has a rounded endthereof embraced by the forked end of release lever 53! pivoted on guideplate M6. Offset end 132 of lever G3! is urged upwardly by spring 433and underlies a shoulder (Figures 16 and 17) formed on link 534 which ispivotally connected at 336 to multiplier rack release slide 33']. Slide43? is mounted for limited vertical sliding movement on multiplier plate562 and is urged to its upper or inactive position by spring 438connected between the upper end thereof and plate 362. Movement of therelease slide downwardly from its'inactive position serves through link434,1ever 33i and pawl 328 to release the multiplier rack, and to effectsuch movement,

slide 431 is provided with a plurality of similar vertically spaced earnsurfaces for cooperation with pins 439 on links 4| I.

From the above description it is seen that depression of a key itl,through the associated link 4 and pins 43s thereon serves to move slide43'. and link 43-4 downwardly, thereby rocking lever 43| and pawl 428 torelease multiplier rack 321. This condition is illustrated in Figure 19where rack MI is shown in full lines as positioned with the one keydepressed, and in dotted lines as positioned with the eight keydepressed.

The movement of multiplier rack 62! from its inactive position'shown inFigure 17 serves to release a spring-pressed restrained element orbellcrank d ll (Figures 16 and 17) pivoted at M2 and urged-in aclockwise direction by compara- Bellcrank MI is restrained by theengagement of horizontal arm 444 thereof with roller stud 4 26 on rack 2E. Upon-movement of rack 42E toactive position, bellcrank 4M moves"under the influenceof spring M3 from the position shown in Figure 17 tothat shown in Figure 19.

To set the plus-minus gears by movement of bellcrank 4 the vertical arm54'! thereof has its upper bent end operatively related with, butslightly spaced fromstud 448 of arm 449 which is secured on shaft 81. Asheretofore described, rocking of shaft 81 controls the position of the

